An Indonesia AirAsia flight went missing on Sunday about half way between its origin of Surabaya in Indonesia and its destination of Singapore, an Indonesian transport official said.

The aircraft was between the Indonesian port of Tanjung Pandan and the town of Pontianak, in West Kalimantan on Borneo island, when it went missing, Joko Muryo Atmodjo, air transportation director at the Transport Ministry, told a news conference.

The aircraft had been flying at 32,000 feet and had asked to fly at 38,000 feet to avoid clouds, he said.